Sectional furnace



J. DOHERTY Sept. 23, 1930.

SECTIONAL FURNACE Original Filed March 21, 1923 .io a i for bringing about these results in the most e'flective'manner. In the furnace in whichmy inventionis embodied, the front sections Patented Sept. 23, 1930 JAMES IDOHERTY, OF CHICAGO, ILLINOIS;

ELLA MAUD DOHERTY, EXECUTRIX', AND

JAMES RUSSELL DOHERTY, EXECUTOR, OF SAID JAMES DOHERTY, DECEASED SECTIONAL FURNACE j Application filed March 21, 1923, seria wo. 626,455; Renewed January 24, 1929.

' My invention relates to a sectionalfurnace of known type, which is made up of an assem-i blediseries of hollow-water containing sections and'in which it'is sought to procure complete combustion reaction and to render the furnace? smokeless by the introduction of heated auxiliary air, the structure and objects thus this art. 1 QMy invention is concerned with the means generally recited being familiar in form-the fire box, the intermediate sections the firebox and flue space, and the rear sections the back of the furnace and the com munication between the flue space and overhead flues. The gases passing into the rear of these flues burn with a yellow flame, which indicates incomplete combustion and I there fore introduce auxiliary air (preferably highly heated) into these flues near their rear thus changing the yellow to ablue or white flame indicating more perfect combustion. For introducing auxiliaryair at this point, means of simple design and low cost 1 areeniployed adapted todeliver the air in a. I V heated state into and across the fire gas flow. Such means, if the best results areto be obtained, substantially encircles the fire gas flow, and is preferably constructed as a unit which may be insertedand removed as such, andwith which the structure of one or more ofthe hollow water-containing furnace sections is adapted to coac't as hereinafter explained.

7 Referring to the drawings: i Fig. 1 is a side elevation, partly in section of a furnace embodying my invention.

1;' Fig.2 is a front elevation on a line II II of Fig. 1, looking toward the rear of the fur- 'inace, part of one of the air delivery boxes being in section.

FigQJ3is a sectional plan on the lines -'IIIIIIofFig.2,ahd'

Fig.4 is a perspective View of'the'firegas encircling air distributing box. v l v I The furnace in which my invention 1S lllustrated is made up of a series ofhollow [water-containing sections 1 bolted together to that end. The front plate 3 has the usual door and damper arrangements; The sections referred to are provided with aligned v openings forming the fire box 6, flue space 7,

overhead side return fiues 8 and common escape flue 9, the flow of the gases being usual, as indicated by the arrows. Grate bars 10 of ordinary pattern support the fuel bed. The front unit 1? is provided with a fuel feed door 11 andwith clean out doors 12, whereby access to the overhead flues may be obtained.

In the preferred form of my invention, I make use of a flue-encircling air distributing and delivering unit, insertable and removable as such, formed as a box 13, having air delivery openings or exit means 14:around its inner walls andprovided'in its projecting end 15 with a damper 16*for controlling the air admission. "This air delivery box is adapted to fit in a depression or countersink in a section 1 adjacent the rear end of oneof the side flues. In the specific construction illustrated, the section 1 is provided with Wall portions 17' and 18, which su pport the airdistributing unit 13 so that its lower side is subjectedtonthe heatof the the gases as appears in Figures 1 and 2. Thebackwall of the recess of the section 1 ismarked 19; and the adjacent side wall of therecess is marked The rear'side of the,;air-box 13 rests 'againstthe' wallj19 and its upper side against the *angular'wall 20. A similar air box is similarly arranged'in each side flue, the design of the sectiond. being symmetrical and thus the wall portions 18, which support the inner ends of the boxes, are formed by'the endslof the middle cross wall member 21 of said section. {As thus arranged the inner ends of the boxes may bedirectlyexposed to a g e flow in the middle flue sothat the recess receiving the air distributing and delivery box might be formed in faces of adjacent sections instead of entirely in the. face of one section but the construction shown being cheapest. and simplest ,is preferred. The terms front face and front wallv' as used in several of the claims apply to either transverse face of the section. It will be observed: thati'iihe; airdelivering inner; walls; of: the bozc lirare. shownlinregist'rywith; and as, in effect, constituting a part of the inner flue walls. This is desirable since the box thus does not restrict the flue passage. It will be observed further that box-receiving recesses inthe section l areopen on their outer sides so that-if; necess ary. the. boxes :can be inserted after" assembly of the] sections, av luting; of stove. putt-y being used; to. seal. the. crevice around it; obviouslyv the boxes; when so mounted are readily removable, whichisdesir-able" While thorough, distribution and advance heating ofitheair. promotes the combustion reaction. generally throughout. the firegas flow ini-thelflue, it is. nevertheless, advantageous andiapart of. this invention to introduce into, the. side fluesat about the: point stated, even. where such distribution. or. prior heating. is not.effec.ted, .and the modification illustrated inliigs. fiandfi'ishowsza construe tion iIL which thisjobj ect. isv obtained, simply bytlieprovision of sleevesor bushingsi22'insented in. openings: 23.. through: the. water spaeeatztlie outersides oftherespective side flues.8:,. and preferably located inrecesses. 23 open to the. front for. convenience in. casting and; ready assemblingv Butterfly or other dampersfle, controlItheadmission of. air.

,- The term; fire gas. flow space as usediin someof ithe; claimsis intended: to imply limitingaordefiningstructure and is to be understondasf-applicable.to. the fire box as well as to flues andrpassages through Which'fire gasesv its flow. Thephrase laterally adjoining! alsomadeuseof in. certain claimsisdesigned ,to.- ;stat e the relation of fines. 8 and 9 to the flregbox as wellaas the relation offlues. 8 and 9 .toeachtother. r

.1. A; sectional furnacemade. up of an as: semhled, series ofJcast': hollow" water-contain.- iing sections having in their lower partaligned. openings forming afireboxand flue. space in ,rear: thereof. and 'in' communicationthereopenings constituting an overheadv return flue incommumcatlou with sald 'flue' space and ,fireboiig; andl fire-.gaswembracing air delivery .meansihavin'g, inner. walls. in substantial. reg stry with saldreturn flue. so as to -formair. and-i delivering it. to the: fire .gas. flow 2.; A..sectional. furnace. made up of. an. as-

with and. having in; their. upper part aligned ing sections having in their lower part aligned openings forming a firebox and flue space in rear thereof and in communication there 7 aligned openings constituting an overhead returnflue, one. of said sections. adjacent the 7 rear of'said overhead flue having in its front face a. depression bordering on'said overhead line, and an auxiliary air. deliveryunit, ems bracing the fire gas flow in the flue, fittingin saiddepression or recess so asto takeup substantiallythe space between the said'se'c'tion 7 space in. rearthereof andincommuni'cation f therewith. and having in their upper part s5" and the section immediately adjacentjthe same at the. point where said recess is located andlconstitutinginefliect a part'ofthe flue.

4. A: sectionalfurnace made up of. an as: sembledseriesfofjcast hollow wate'r-containing sections having intheir lower part, aligned; openings forming a fire-box and" aligned openings. over the-sameconstituting a flue in communication therewith, 'saidhollowwatercooled structure having therein air b'ox-re ceivingspace bordering onrsaidgfl'ue, and an air. dellvery' box. removably seated, in. said space constituting part of the flue wall, em:

loo-- bracingjthe'flue space and abutting onthe I flre gas flow in; saidflue and. delivering, air theretoJ f i 5. A. sectional furnace'made up ofan as.- sembled" series. of cast. hollow water-contain.-

'ingsections. having ,in' their lower part aligned. openings; forming a fire-box and flue spaoein rear. thereof and'in communication therewith and having in the upper. part aligned openings. constituting an. overhead return fluesaid; hollow water-containing rounding; said: return flue and opening air. deliver-y boXinsertable-into and removstructure havingjair-boxrreceiving, space sur able from said space through said. wall as a 1 unit and when. seated therein embracing; the

flue spa'ce and abutting on the fire-gas flow a 'iILSaidflueQ. i in; effect. a. part of said, flue for distributing .6. A sectional furnace. made up offanassembled; series: of cast lioll'ow water-containinggbsections, having in their low er part space inrear thereof. and'in comunic'ationtherewith and having in their "upperpart sets; of aligned openingsconstituting over head return flues extending lengthwise, one at each side of the furnace, and in communication with the flue ,spaceand the firebox, and an intermediate flueto which the return flues deliver, there being also an opening to each of said overhead flues from the combustion space below it, and side openings,

from eachlreturn flue to the intermediate flue,

and. air delivery devices each respectively,

therewith, and having in their upper part aligned openings constitiuting overhead side flues in comunication with said flue space and firebox, and fire-gas-embracingair delivery means located adj acentthe rear end of each of said overhead side flues and conforming to the inner walls of the side flues and leaving the flue space substantially unobstructed.

8. A sectional furnace made up of an assembled series of cast hollow water-containing sections having in their lower part aligned openings constituting a fire box and aligned openings over the same at each side of the furnace constituting overhead return flues in communication with said fire-box,

and a fire gas embracing air delivery box bordering on and del vering air to each side flue space, closing an opening from the flue to the fire gas space below it and whose imperforate underside is subject to contact by fire gases passing from the fire box to the flue. v a 7 95A sectional furnace made up of an assembled series of cast hollow water-containing sections having in their lower part aligned openings constituting a fire box and flue space 1n rear thereof and 1n communication therewith, and three series of aligned openings arranged in transverse relation above the firebox openings, and an air de '7 livery box embracing and delivering-to the fire gas flow space of each side fine and closing an opening to the intermediate flue, said boxes thus having their mutually adjacent sides subject to contact by fire gases in the intermediate flue, openings being provided for permitting fire gases to pass from the fire 7 box to the overhead flues.

10. In a sectional furnace a containing section having an opening in its lower part constituting combustion or fine space and three transversely related flue open- I ings above the same, the said section having a depression in its front wall adjacent each ofsaid side return flue openings extending to the middle flue opening and adapted to receive a flue-opening-embracing air delivery hollow waterunit, whereby each air delivery unit is adapted to be subject to contactof fire gases in its side flue opening and in the middle flue open- 1ng.- i

11. In a sectional'furnace ahollow watercontaining section having an opening in its lower part, constituting combustion or flue space and three transversely'related flue openings above thesame, the said section having a depression in its front fall adjacent each of said side return flue openings extending to the middle flue opening and adapted to receive a flue space-embracingair delivery unit, the said section having part of its front wall displaced rearwarldly and extending from each side flue space to the'combustion or flue 12. A sectional furnace made up of an assembled series of cast hollow-water-containing sections havlng -1n their lower parts aligned openings forming a firebox and flue therewith and having in their'upper part aligned openings constituting an overhead flue in communication with the flue space and firebox, there beinglalso an opening to said overhead flue from the combustion space below it, and a separately made air delivery device-constructed to "close said openingwhen placed therein and to be contacted by fire gases passing from the firebox to said flue and having means to deliver air to said overhead flue V I I 13. In a'sectional'furnaca-an assembled series of hollow water-containing sections forming byopenings in the structure of successive sections laterally adjoining fire gas flow and'return flow spaces, there being intermediate the lengths of said fire gas flow spaces an opening between water cooled walls from one of said fire gas flow spaces to the other, and a separately made metal air delivery device supported in and obstructing said opening bysimperforate wall structure facing one of said-fire gas flow spaces and having wall structure facing the other and provided with means for delivering thereto air thus heated. 114,111 a sectional furnace, assembled hollow water-containing sections forming by openings therein three adjoining fire gas flow spaces having water cooled walls, one of said fire gas flow spaces opening into each of the other two intermediate their lengths, said openings having water cooled walls, and a separately made hollow air delivery device occupying'bothsaid openings, subject to fire gascontactin eachof saidtwo fire gas flow spaces, and having means for delivering air thus heated to the otheriof said fire gas flow spaces. v i

space in rear thereof and in communication 25 I one of said defined; fire gasfiow spaces, and a separately 'mad'eair delivery device of a size In a sectional furnace, an assembled seriesof transverse hollow 'water containing sections having sets of communicating open ings having defining water cooled walls and formingfour adjacent fire gas-*flow spaces, therebeing openings having water cooled walls and extending from each of said fire gas flow space-sintotwokof' the others, and

separatelymade air delivery conduit means removably supported in said structure in' p0- sition to occupy allsaid inter-flue openings, said conduit means being provided with means for delivering-to two of said firegas flow spaces airheated by contact with said 15 conduitmeans of'firegases in t'wo of said other fire-gas flow'spaces; V 16; In asect onalfurnaceg an assembled se'-- rles of hollow water-containing SGIGlJlOIIS" formingby openings in, thestructure-of suck 'cessive sectionssubstantially parallel fire gasfiow spaces having defining water cooled;

walls, the sectional structure providingan opening from one to the other between water cooled Walls and a correspondingly located opening from the outsideoii the furnace; to

and shape enabling-it to beinserted and. removed through s-aidlastopening-and occupy-- ing the opening between said fire gas; flow spaces, said air delivery device havingoppoisite sides respectively perforate andi inp'ersembled series 'ofca'st hollow water-contain ingf water cooled: walls said hollow water containing sectional! structure". having a.) re

cess' extending along: a side of: saidsifiue touts fluezs'pace and anlopening-sfromthe out,

side'ofithe furnace'toatherecessiand fine-space,

a separately made removable air duct fittingf said: recessand removable; therefromthrough.

said opening Without; disassembling the SEC-:5

tion'sgisaid: air duct: having inlet; means for;

outside air and internal outlets fondistributing aircto: the;v fire-gas; flow the; fl V In: testimony whereof, 1 have: signed specification. 1 i

- t Janice-nonlinear forateeach facing one of said respective fire 7 gas flow spaces to distribute to 'one fi re: gas fiowspace air heated by firegasesiin the. other. v I a 17. In a sectionalfurnacaa hollow watercontaining section having an opening in its lower part providing defined space for com 5 bustion and three flue openings above the 7 same extendingthrough the section from' series of hollow water-containing sections havingsets of communicating openings hav ing'water cooledwalls and forming four 'laterally adjoining fire gas fiow spaces, there being intermediate the ends of eachsof said spaces openings into" each ofi-two of" the c others, the walls defining saidopenings-being water cooled; and two separately made air de- I livery conduits ofsuch' sizeand shape'asto occupy allsaid" openings, each subject'to contact/of firegvgases in t-we of 'said'nregaskflowv spaces and provided with meansffor" deliv erin'g to another of said fire gas flow spaces air heated by such contact.

19. A sectional furnace comprising an as 

